1. (noun) selenium, Se, atomic number 34
a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)
Synonyms: sou'-east, atomic number 34, selenium, southeast, southeastward
2. (noun) southeast, sou'-east, southeastward, SE
the compass point midway between south and east; at 135 degrees
Synonyms: sou'-east, selenium, atomic number 34, southeastern United States, southeast, southeastward
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Synonyms for se 
